[Firewall] patch for gentoo

hi,
in Gentoo it is needed to replace opts variable with extra_* variables in
all init.d files as using opts is being deprecated and currently it results
the following warning:
* Use of the opts variable is deprecated and will be
* removed in the future.
* Please use extra_commands or extra_started_commands.
Please find a patch attached for replacing this bit in the according
rc.firewall file in the official package and let me know what would be the
best to do in order to include this change in the next release :)
regards,
FErki
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